As far as I'm aware, my eyes stay open throughout. The visual treat is far too good to miss!

My wife, though, is unable to avoid closing her eyes when she cums. She enjoys looking at me in the build-up, but as she approaches orgasm, her eyes at first glaze over and then she is unable to keep them open even if she tries very hard to do so. For me, it's gorgeous to watch my wife having to squeeze her eyelids tightly together, as part of the taut expression of total focus on her face as the lovely sensations inside her build to a climax and burst out all over her.